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How do find the max and min value of the pixels in an image? Assume there is a ready-baked render image and I want to ascertain the max and min RGB value across all pixels of the render.

Vitalii Sadovshikov
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  • In the image editor side panel there's a tab called "Scopes". One of the scopes is the histogram, but that only gets you the overview. You can hand sample individual pixels using the eyedropper from the toolbar to get exact values, but as far as I know, there is no built-in way to get the min/max. It wouldn't be hard to write a python script; probably using numpy but this sounds like a better task for image processing software. – Marty Fouts Jan 17 '22 at 16:22
  • Yea, but I want to obtain precise values for utilizing them in the Compositing purpose – Vitalii Sadovshikov Jan 17 '22 at 17:08
  • Is python scripting an option ? – Gorgious Jan 17 '22 at 21:30
  • @Gorgious Yea, of course! – Vitalii Sadovshikov Jan 22 '22 at 11:00
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    Does this help ? https://blender.stackexchange.com/a/124265/86891 – Gorgious Jan 22 '22 at 11:02
  • Thank you, I should dig in – Vitalii Sadovshikov Jan 22 '22 at 11:04
  • @Gorgious Okay, it for sure does sense but I am a little bit confused about how to do the same not for an imported image but for data that are going from an output of a node in Compositing. Assume we wanna get the max and min values from the V (value) output of the "Separate HSVA" node is it possible? – Vitalii Sadovshikov Jan 22 '22 at 11:20

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